/Engine/Plugins/Developer/Concert/ConcertMain/Source/ConcertTransport/Public/IConcertEndpoint.h
typedef TMulticastDelegate_FourParams< void, const [FConcertEndpointContext](API\Plugins\ConcertTransport\FConcertEndpointContext) &, const [FConcertEndpointContext](API\Plugins\ConcertTransport\FConcertEndpointContext) &, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IConcertMessage](API\Plugins\ConcertTransport\IConcertMessage) > &, const [FConcertMessageContext](API\Plugins\ConcertTransport\FConcertMessageContext) & > FOnConcertMessageAcknowledgementReceivedFromLocalEndpoint